A parallel plate capacitor whose capacitance C is 14 pF is charged by a battery to a potential difference V = 12 V between its plates. The charging battery is now disconnected and a porcelain plate wi

Question

A parallel plate capacitor whose capacitance $C$ is $14 pF$ is charged by a battery to a potential difference $V = 12 V$ between its plates. The charging battery is now disconnected and a porcelain plate with $k = 7$ is inserted between the plates, then the plate would oscillate back and forth between the plates with a constant mechanical energy of _______ $pJ .$

(Assume no friction)

TestHub · Accepted Answer

U i = 1 2 × 14 × 12 × 12 pJ ∵ U = 1 2 C V 2 = 1008 pJ U f = 1008 7 pJ = 144 pJ ∵ C m = k C 0 Mechanical energy = Δ U = 1008 - 144 = 864 pJ

Physics - Capacitor Question with Solution | TestHub

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